// Copyright (c) 2024 PaddlePaddle Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#pragma once

#include "paddle/ap/include/adt/adt.h"
#include "paddle/ap/include/axpr/method_class.h"

namespace ap::axpr {

template <typename ValueT>
class InterpreterBase;

template <typename ValueT>
adt::Result<std::string> ToString(InterpreterBase<ValueT>* interpreter,
                                  const ValueT& val) {
  const auto& func = MethodClass<ValueT>::ToString(val);
  using RetT = adt::Result<std::string>;
  return func.Match(
      [&](const adt::Nothing&) -> RetT {
        return adt::errors::TypeError{GetTypeName(val) +
                                      " class has no __str__ function"};
      },
      [&](adt::Result<ValueT> (*unary_func)(const ValueT&)) -> RetT {
        ADT_LET_CONST_REF(str_val, unary_func(val));
        ADT_LET_CONST_REF(str, str_val.template TryGet<std::string>());
        return str;
      },
      [&](adt::Result<ValueT> (*unary_func)(InterpreterBase<ValueT>*,
                                            const ValueT&)) -> RetT {
        ADT_LET_CONST_REF(str_val, unary_func(interpreter, val));
        ADT_LET_CONST_REF(str, str_val.template TryGet<std::string>());
        return str;
      });
}

template <typename ValueT>
std::string ToDebugString(InterpreterBase<ValueT>* interpreter,
                          const ValueT& val) {
  const auto& str = ToString(interpreter, val);
  if (str.HasError()) {
    return "[invalid debug string]";
  }
  return str.GetOkValue();
}

}  // namespace ap::axpr
